Ayup, although it made me think more of the weird energy rings from when the Death Star's first stages are firing. (Not that, er, they look much like that. I think the purely cylindrical appearance of the dangerous glowing in this shot, rather than usual jet tail, has set my brain firmly to "death ray".)

Actually, no. Pretty much all jet engines for supersonic aircraft have those. They're not for vectoring, they allow the area of the nozzle to be adjusted to optimize the thrust for given throttle levels and atmospheric pressure at different speeds and altitudes.

While a version of the F135 does vector (for the F-35B), it is not the petals but a 'lobster tail' segment upstream of the petals that does the vectoring.

Edit: Oh, and to clarify, yes, there are some engines, notably Russian, which do use the nozzle petals to do some thrust vectoring, but none in the West at this time. The F-22 has vectoring, but uses a '2-D' nozzle with a square aperture, not the round petal design.